feat: reminder email opt-in 1 hour before registration opens

packages/db/src/migrations/0007_reminder.sql

@@ -0,0 +1,9 @@
+-- Add reminder table for email reminders 1 hour before registration opens
+CREATE TABLE `reminder` (
+	`id` text PRIMARY KEY NOT NULL,
+	`email` text NOT NULL,
+	`sent_at` integer,
+	`created_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL
+);
+--> statement-breakpoint
+CREATE INDEX `reminder_email_idx` ON `reminder` (`email`);